ORIGINAL: Bucky10 A .264 or .270? I think that common sense would be the 270 but why does a .264 shell look bigger?
Merely because IT IS BIGGER! The cartridge case, that is! The .270 bullet is .277" to .278" in diameter, and the .264 bullet is .264" in diameter. Thus, the .270 has a bigger bullet diameter. But the .264 Win. is a belted magnum. Its' case holds quite a lot more powder than the .270. It therefore has a higher MV than the .270, but not by much! Performance-wise, both are in the same class.